In Linux, FreeBSD, NetBSD /dev/full, or the always-full device,[1][2] is a special file that always returns the error code ENOSPC (meaning "No space left on device") on writing, and provides an infinite number of zero bytes to any process that reads from it (similar to /dev/zero). This device is usually used when testing the behaviour of a program when it encounters a "disk full" error.
$ echo "Hello world" > /dev/full
bash: echo: write error: No space left on device
History
editSupport for the always-full device in Linux is documented as early as 2007.[2] Native support was added to FreeBSD in the 11.0 release in 2016,[3] which had previously supported it through an optional module called lindev.[3][4] The full device appeared in NetBSD 8.[5]
See also
edit- /dev
- /dev/null
- /dev/zero
- Fault injection
- /dev/mordor in 9front
References
edit- ^ Aoki, Osamu (November 22, 2010). "Chapter 1. GNU/Linux tutorials". Archived from the original on 2010-06-15. Retrieved November 22, 2010.
- ^ a b "Man Page for full (Linux section 4)". November 24, 2007. Archived from the original on February 5, 2013. Retrieved June 1, 2011.
- ^ a b "FreeBSD 11.0-RELEASE Release Notes". FreeBSD official site. Archived from the original on 11 October 2016. Retrieved 9 March 2019.
- ^ "LINDEV(4) Device Drivers Manual". Debian. Archived from the original on 2021-05-15. Retrieved 2021-05-15.
- ^ "full(4) - NetBSD Manual Pages". NetBSD. Archived from the original on 2021-05-15.
